Why can't sound be heard in a vacuum?

• Sound cannot be heard in a vacuum because there are no particles.

• Sound can travel in a vacuum just like light.

• Sound is absorbed by the vacuum.

• Sound requires a medium to travel, which is absent in a vacuum.

What is the term for the lowest point of a wave?

• Crest

• Trough

• Wave height

• Amplitude

What is the speed of sound in air?

• 300 meters per second

• 343 meters per second

• 400 meters per second

• 250 meters per second

What happens to the wavelength when the frequency of a wave increases?

• The wavelength increases when the frequency increases.

• The wavelength remains the same when the frequency increases.

• The wavelength decreases when the frequency increases.

• The wavelength becomes unpredictable when the frequency increases.

When more energy is added to a wave, its amplitude does what?

• The amplitude decreases.

• The amplitude remains the same.

• The amplitude increases when more energy is added to a wave.

• The amplitude fluctuates randomly.

Which of these is true of sound waves?

• Sound waves can travel through a vacuum.

• Sound waves require particles to work.

• Sound waves are a form of electromagnetic radiation.

• Sound waves travel faster in air than in water.

What is a wave that moves in the same direction as the energy called?

• Transverse waves

• Longitudinal waves

• Surface waves

• Standing waves

What is the effect called when a wave bends as it passes from one medium to another?

• Reflection

• Refraction

• Diffraction

• Transmission

What type of wave can travel through solids, liquids, and gases?

• Electromagnetic waves

• Mechanical waves

• Surface waves

• Transverse waves

What type of wave travels up and down?

• Longitudinal waves

• Transverse waves

• Surface waves

• Mechanical waves